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- PDB-8flm: Cryo-EM structure of STING oligomer bound to cGAMP, NVS-STG2 and C53 -

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Basic information

Entry
Database: PDB / ID: 8flm
TitleCryo-EM structure of STING oligomer bound to cGAMP, NVS-STG2 and C53
ComponentsStimulator of interferon genes protein
KeywordsIMMUNE SYSTEM / STING / innate immunity / molecular glue
Function / homology
Function and homology information


STING complex / STAT6-mediated induction of chemokines / protein localization to endoplasmic reticulum / 2',3'-cyclic GMP-AMP binding / cyclic-di-GMP binding / STING mediated induction of host immune responses / serine/threonine protein kinase complex / positive regulation of type I interferon-mediated signaling pathway / IRF3-mediated induction of type I IFN / cGAS/STING signaling pathway ...STING complex / STAT6-mediated induction of chemokines / protein localization to endoplasmic reticulum / 2',3'-cyclic GMP-AMP binding / cyclic-di-GMP binding / STING mediated induction of host immune responses / serine/threonine protein kinase complex / positive regulation of type I interferon-mediated signaling pathway / IRF3-mediated induction of type I IFN / cGAS/STING signaling pathway / proton channel activity / pattern recognition receptor signaling pathway / reticulophagy / cytoplasmic pattern recognition receptor signaling pathway / cellular response to exogenous dsRNA / protein complex oligomerization / autophagosome membrane / positive regulation of macroautophagy / autophagosome assembly / positive regulation of type I interferon production / positive regulation of DNA-binding transcription factor activity / cellular response to interferon-beta / positive regulation of defense response to virus by host / signaling adaptor activity / antiviral innate immune response / endoplasmic reticulum-Golgi intermediate compartment membrane / activation of innate immune response / Regulation of innate immune responses to cytosolic DNA / positive regulation of interferon-beta production / protein serine/threonine kinase binding / autophagosome / cytoplasmic vesicle membrane / secretory granule membrane / SARS-CoV-1 activates/modulates innate immune responses / peroxisome / regulation of inflammatory response / defense response to virus / DNA-binding transcription factor binding / RNA polymerase II-specific DNA-binding transcription factor binding / mitochondrial outer membrane / endosome / cilium / ciliary basal body / Golgi membrane / innate immune response / ubiquitin protein ligase binding / Neutrophil degranulation / protein kinase binding / endoplasmic reticulum membrane / perinuclear region of cytoplasm / SARS-CoV-2 activates/modulates innate and adaptive immune responses / protein homodimerization activity / positive regulation of transcription by RNA polymerase II / nucleoplasm / identical protein binding / plasma membrane / cytosol
Similarity search - Function
: / STING transmembrane domain / : / : / Stimulator of interferon genes protein / Stimulator of interferon genes protein, C-terminal domain superfamily / STING ligand-binding domain
Similarity search - Domain/homology
cGAMP / Chem-9IM / Chem-Y6H / Stimulator of interferon genes protein
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsLi, J. / Canham, S.M. / Zhang, X. / Bai, X. / Feng, Y.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM130289 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM143158 United States
Robert A. Welch FoundationI-1702 United States
Robert A. Welch FoundationI-1944 United States
CitationJournal: Nat Chem Biol / Year: 2024
Title: Activation of human STING by a molecular glue-like compound.
Authors: Jie Li / Stephen M Canham / Hua Wu / Martin Henault / Lihao Chen / Guoxun Liu / Yu Chen / Gary Yu / Howard R Miller / Viktor Hornak / Scott M Brittain / Gregory A Michaud / Antonin Tutter / ...Authors: Jie Li / Stephen M Canham / Hua Wu / Martin Henault / Lihao Chen / Guoxun Liu / Yu Chen / Gary Yu / Howard R Miller / Viktor Hornak / Scott M Brittain / Gregory A Michaud / Antonin Tutter / Wendy Broom / Mary Ellen Digan / Sarah M McWhirter / Kelsey E Sivick / Helen T Pham / Christine H Chen / George S Tria / Jeffery M McKenna / Markus Schirle / Xiaohong Mao / Thomas B Nicholson / Yuan Wang / Jeremy L Jenkins / Rishi K Jain / John A Tallarico / Sejal J Patel / Lianxing Zheng / Nathan T Ross / Charles Y Cho / Xuewu Zhang / Xiao-Chen Bai / Yan Feng /
Abstract: Stimulator of interferon genes (STING) is a dimeric transmembrane adapter protein that plays a key role in the human innate immune response to infection and has been therapeutically exploited for its ...Stimulator of interferon genes (STING) is a dimeric transmembrane adapter protein that plays a key role in the human innate immune response to infection and has been therapeutically exploited for its antitumor activity. The activation of STING requires its high-order oligomerization, which could be induced by binding of the endogenous ligand, cGAMP, to the cytosolic ligand-binding domain. Here we report the discovery through functional screens of a class of compounds, named NVS-STGs, that activate human STING. Our cryo-EM structures show that NVS-STG2 induces the high-order oligomerization of human STING by binding to a pocket between the transmembrane domains of the neighboring STING dimers, effectively acting as a molecular glue. Our functional assays showed that NVS-STG2 could elicit potent STING-mediated immune responses in cells and antitumor activities in animal models.
History
DepositionDec 21, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 1, 2023Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Nov 1, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Mar 13, 2024Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year
Revision 1.2Jun 4, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
Item: _em_admin.last_update / _em_software.name / _pdbx_entry_details.has_protein_modification
Revision 1.1Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Stimulator of interferon genes protein
B: Stimulator of interferon genes protein
C: Stimulator of interferon genes protein
D: Stimulator of interferon genes protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)161,39910
Polymers158,2144
Non-polymers3,1866
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: assay for oligomerization
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Stimulator of interferon genes protein / hSTING / Endoplasmic reticulum interferon stimulator / ERIS / Mediator of IRF3 activation / hMITA / ...hSTING / Endoplasmic reticulum interferon stimulator / ERIS / Mediator of IRF3 activation / hMITA / Transmembrane protein 173


Mass: 39553.398 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: STING1, ERIS, MITA, TMEM173 / Production host: Homo sapiens (human) / References: UniProt: Q86WV6
#2: Chemical ChemComp-Y6H / 4-({[4-(2-tert-butyl-5,5-dimethyl-1,3-dioxan-2-yl)phenyl]methyl}amino)-3-methoxybenzoic acid


Mass: 427.533 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C25H33NO5 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-1SY / cGAMP / 2',3' cGAMP / c-GMP-AMP / c[G(2',5')pA(3',5')p]


Mass: 674.411 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C20H24N10O13P2 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-9IM / 1-[(2-chloro-6-fluorophenyl)methyl]-3,3-dimethyl-2-oxo-N-[(2,4,6-trifluorophenyl)methyl]-2,3-dihydro-1H-indole-6-carboxamide


Mass: 490.877 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C25H19ClF4N2O2 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: STING tetramer / Type: COMPLEX
Details: STING tetramer, which can further assemblies into larger oligomers, induced by cGAMP, NVS-STG2 and C53
Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.3 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 292483 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00310446
ELECTRON MICROSCOPYf_angle_d0.65714216
ELECTRON MICROSCOPYf_dihedral_angle_d10.3631448
ELECTRON MICROSCOPYf_chiral_restr0.0351582
ELECTRON MICROSCOPYf_plane_restr0.0031786

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